One of the main features of this sick and sad era in international relations is that hugely important developments are ignored, having no effect on Western policy. Here’s one such case: Indian investigators have confirmed that Pakistani intelligence was deeply involved in the massive, bloody Mumbai terror attack in 2008, killing 166 people.

The story should be on the front-page of every Western newspaper.

This Pakistani involvement has long been suspected, but now there is strong evidence on the record. Remember: Pakistan is a huge U.S. aid recipient. It suffers no consequences for being a sponsor of terrorism -- not only after this case, but also after previous attacks and after helping terrorist groups in Afghanistan.

The strategy of ignoring this problem fits into the broader strategy of the Obama administration: buy short-term quiet and apparent popularity at the price of strategic decline and future crises. Let’s go through the Mumbai story, and then look at the bigger picture.

The group carrying out the Mumbai attack was Lashkar-e-Taiba, an organization completely dependent on Pakistani financing, training, arming, and providing safe haven for them.

U.S. officials now have new and dramatic evidence of this, because the source for the information is an American in U.S. custody. His name is David Headley. He has pleaded guilty in a federal court of involvement in the attack and is cooperating with the government. He has detailed how officers from the Inter-Services Intelligence agency, Pakistan’s notorious intelligence force, helped carry out the raid.

According to Headley, as recorded in a report on the interrogation, the Pakistanis directed and funded the group. In Headley’s case, he was trained as a spy, paid, and sent to India where he took photos and videos of potential places for attack. The material was turned over to the group’s intelligence liaison, who then suggested where and how to kill lots of people, including American citizens staying in hotels and the office of the Jewish Chabad group.

This should lead to a major crisis in U.S.-Pakistan relations, regardless of the fact that Pakistan is “helping” the United States against al-Qaeda and the Taliban. How much is it helping? U.S. officials have also reported that Pakistani intelligence is assisting the Taliban in killing Americans in Pakistan, and is not working all that hard to find Osama bin Laden and his friends.

Now let’s be clear: there has been a genuine policy dilemma for the United States, with the need to balance Pakistani help against Pakistani sabotage of U.S. policy and terrorism. The point is that the Mumbai information should be the last straw.